Doctors can and sometimes do prescribe antidepressants at a first appointment, but it depends on how severe your symptoms are. For moderate to severe depression, a prescription on the same day is common. For milder symptoms, your doctor may suggest a waiting period or therapy first before considering medication.
What Happens at the First Appointment
Your doctor will typically start with a screening questionnaire, often the PHQ-9, which scores your depression symptoms on a scale of 0 to 27. That number helps guide what happens next. A score in the severe range (20 to 27) generally leads to immediate medication alongside a referral for therapy. Moderate scores often prompt a conversation about whether you’d prefer therapy, medication, or both. Lower scores may lead your doctor to recommend lifestyle changes or therapy alone as a first step.
A first psychiatric evaluation typically lasts 30 to 90 minutes. That’s enough time for a thorough conversation about your symptoms, medical history, and daily functioning, plus a treatment plan that may or may not include a prescription. If you’re seeing a GP rather than a psychiatrist, the appointment will be shorter, but a same-day prescription is still possible if your symptoms clearly warrant it.
When Doctors Prescribe Right Away
Several situations push doctors toward writing a prescription at the first visit. If you’re experiencing significant functional impairment (struggling to work, eat, sleep, or care for yourself), that’s a strong signal that medication should start sooner rather than later. The American Psychological Association recommends that adults with depression be offered either therapy or a second-generation antidepressant as initial treatment, and for moderate to severe cases, the combination of both.
Safety concerns accelerate the process further. If you’re at risk of self-harm, showing signs of severe self-neglect, or unable to function day to day, guidelines call for addressing the immediate problem first. In those cases, medication is part of stabilizing the situation before other treatments can even begin.
When They May Ask You to Wait
For milder symptoms, particularly what clinicians call “subthreshold” depression (real distress, but not yet meeting the full criteria for a depressive disorder), guidelines recommend a period of watchful waiting. This isn’t your doctor dismissing your concerns. It’s an active clinical decision to monitor your symptoms over a set timeframe before starting treatment, because a significant number of people with mild symptoms improve without medication.
The UK’s NICE guidelines recommend a watchful waiting period of about two weeks. Some stepped-care programs use a three-month window. In one study of patients with subthreshold depression, symptoms decreased meaningfully after three months of monitoring alone. Your doctor will typically schedule a follow-up during this period to reassess whether your symptoms have improved, stayed the same, or worsened.
Certain factors make it less likely that watchful waiting will be enough. A history of previous depressive episodes, higher symptom severity at the start, and difficulty adjusting to major life stressors all predict a lower chance of improving without active treatment. If any of these apply to you, your doctor may shorten the waiting period or skip it entirely.
Tests They Might Run First
Before diagnosing depression and starting medication, your doctor may order blood tests to rule out conditions that mimic depressive symptoms. Thyroid problems are the most common culprit. An underactive thyroid can cause fatigue, low mood, weight changes, and difficulty concentrating, all of which overlap with depression. Checking thyroid function, along with basic blood counts and vitamin levels, helps ensure you’re being treated for the right problem.
This doesn’t necessarily delay your prescription. Some doctors will start medication while waiting for lab results, especially if your symptoms are clearly affecting your quality of life. Others prefer to see the results first, particularly if your symptoms could plausibly have a physical cause.
What to Expect After Getting a Prescription
If your doctor does prescribe an antidepressant at the first visit, you won’t simply be sent off and forgotten. Guidelines recommend an initial follow-up within one to two weeks, with younger patients (under 30) ideally seen within one week due to a slightly elevated risk of side effects early in treatment. In practice, that timeline isn’t always met. One audit of primary care practices found the median time to first follow-up was about 14 to 17 days, and compliance with the recommended window was low.
It’s worth knowing that antidepressants take time to work. Most people don’t feel a meaningful difference for two to four weeks, and full effects can take six to eight weeks. The early follow-up isn’t primarily about checking whether the medication is working yet. It’s about monitoring for side effects, making sure you’re tolerating the dose, and checking in on your safety.
How to Get the Most From Your First Visit
If you’re hoping your doctor will take your symptoms seriously and act quickly, a few things help. Come prepared to describe not just how you feel emotionally, but how your symptoms are affecting your daily life: your sleep, appetite, ability to work, relationships, and motivation. Doctors weigh functional impairment heavily when deciding how aggressively to treat.
Be honest about your history. If you’ve had depressive episodes before, that changes the calculus significantly. Prior episodes make it more likely your doctor will start medication early rather than suggesting a wait-and-see approach. Similarly, if you’ve already tried therapy or lifestyle changes without improvement, say so. That context helps your doctor understand where you are in the process and match treatment to your actual situation rather than starting from scratch.
If your doctor suggests waiting or trying therapy first and you feel your symptoms are too severe for that approach, say so directly. Treatment guidelines recommend shared decision-making, and your experience of your own suffering is a legitimate factor in determining the right plan.